From 01b51efa63e8f103eac955a5e9686c8bc101b18f Mon Sep 17 00:00:00 2001
From: "Ethan J. Hadley" <ethanscharlie@protonmail.com>
Date: Wed, 19 Aug 2026 23:17:16 -0600
Subject: [PATCH] Downloaded full album with cover art and metadata

---
 CMakeLists.txt | 13 ++++-----
 src/main.cpp   | 77 ++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 78 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d0f617..d73e1ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,14 +16,13 @@ target_include_directories(YTMusicDL26 PUBLIC
 
 include(cmake/CPM.cmake)
 
-# CPMAddPackage(
-#   NAME id3v2lib
-#   GIT_REPOSITORY https://github.com/larsbs/id3v2lib.git
-#   GIT_TAG master
-# )   
+CPMAddPackage("gh:nlohmann/json#v3.12.0")
+CPMAddPackage("gh:curl/curl#curl-8_21_0")
 
-# target_link_libraries(YTMusicDL26 PUBLIC
-# )
+target_link_libraries(YTMusicDL26 PUBLIC
+  nlohmann_json::nlohmann_json
+  CURL::libcurl
+)
 
 file(COPY ${CMAKE_SOURCE_DIR}/bin DESTINATION ${CMAKE_BINARY_DIR})
 
diff --git a/src/main.cpp b/src/main.cpp
index 2950391..41d72f6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,3 +1,6 @@
+#include <curl/curl.h>
+#include <curl/easy.h>
+
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
@@ -5,6 +8,7 @@
 #include <format>
 #include <fstream>
 #include <future>
+#include <nlohmann/json.hpp>
 #include <regex>
 #include <string>
 #include <vector>
@@ -12,6 +16,8 @@
 #define TMP_DOWNLOAD_FOLDER "tmp/download"
 #define MAX_THREADS 4
 
+using json = nlohmann::json;
+
 // This runs in shell, if put through a website interface it would allow for injection
 auto ytdlp(const std::string& args) -> bool {
   system(std::format("bin/linux/yt-dlp {}", args).c_str());
@@ -20,16 +26,22 @@ auto ytdlp(const std::string& args) -> bool {
 
 auto metadata(const std::string& file, const std::string& artist, const std::string& album, size_t index) {
   std::string name = std::filesystem::path(file).filename().string();
+  name = std::regex_replace(name, std::regex(".mp3"), "");
 
   system(std::format("bin/linux/ffmpeg "
                      "-hide_banner -loglevel error "
-                     "-i \"{}\" -c copy "
+                     "-i \"{}\" "
+                     "-i \"{}/cover.jpg\" "
+                     "-map 0:0 "
+                     "-map 1:0 "
+                     "-c copy "
+                     "-id3v2_version 3 -metadata:s:v title=\"Album cover\" -metadata:s:v comment=\"Cover (front)\" "
                      "-metadata title=\"{}\" "
                      "-metadata artist=\"{}\" "
                      "-metadata album=\"{}\" "
                      "-metadata track=\"{}\" "
                      "\"{}/{}_{}.mp3\"",
-                     file, name, artist, album, index, TMP_DOWNLOAD_FOLDER, index, name)
+                     file, TMP_DOWNLOAD_FOLDER, name, artist, album, index, TMP_DOWNLOAD_FOLDER, index, name)
              .c_str());
 }
 
@@ -41,6 +53,38 @@ auto cleanTmpDownloadFolder() -> bool {
   return true;
 }
 
+auto downloadImageToTmpFolder(const std::string& url) -> bool {
+  CURL* curl = curl_easy_init();
+  if (!curl) {
+    printf("ERROR: Failed to initialize curl.\n");
+    return false;
+  }
+
+  FILE* file = std::fopen(std::format("{}/cover.jpg", TMP_DOWNLOAD_FOLDER).c_str(), "wb");
+  if (!file) {
+    curl_easy_cleanup(curl);
+    printf("ERROR: Failed to create cover file.\n");
+    return false;
+  }
+
+  curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, nullptr);
+  curl_easy_setopt(curl, CURLOPT_WRITEDATA, file);
+  curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+
+  CURLcode res = curl_easy_perform(curl);
+
+  std::fclose(file);
+  curl_easy_cleanup(curl);
+
+  if (res != CURLE_OK) {
+    printf("ERROR: %s\n", curl_easy_strerror(res));
+    return false;
+  }
+
+  return true;
+}
+
 auto urlsFromPlaylist(const std::string& url) -> std::vector<std::string> {
   std::vector<std::string> urls;
 
@@ -97,7 +141,7 @@ auto playlistTitle(const std::string& playlistUrl) {
   return s;
 }
 
-auto channelName(const std::string& playlistUrl) {
+auto channelNamePlaylist(const std::string& playlistUrl) {
   std::string s = dataFromYtdlpPlaylist(playlistUrl, "channel");
   s = std::regex_replace(s, std::regex(" - Topic"), "");
   return s;
@@ -161,19 +205,42 @@ auto downloadPlaylist(std::string playlistUrl) -> bool {
 }
 
 auto writeAlbumMetadataToTmpFolder(const std::string& playlistUrl) -> bool {
-  std::string artist = channelName(playlistUrl);
+  std::string artist = channelNamePlaylist(playlistUrl);
   std::string album = playlistTitle(playlistUrl);
   printf("Starting to write metadata for %s by %s.\n", album.c_str(), artist.c_str());
 
+  printf("Finding album cover.\n");
+  std::filesystem::remove("tmp/data.json");
+  ytdlp(
+      std::format("--js-runtimes \"deno:bin/linux/deno\" "
+                  "--dump-single-json "
+                  "\"{}\" "
+                  "> tmp/data.json",
+                  playlistUrl));
+
+  std::ifstream f("tmp/data.json");
+  if (!f) {
+    printf("ERROR: Couldn't open data.json\n");
+    return false;
+  }
+
+  json data = json::parse(f);
+  std::string coverUrl = data["thumbnails"][1]["url"];
+  downloadImageToTmpFolder(coverUrl);
+
+  printf("Writting data to files.\n");
+
   size_t index = 1;
   for (const auto& entry : std::filesystem::directory_iterator(TMP_DOWNLOAD_FOLDER)) {
+    if (std::filesystem::path(entry.path()).filename().string() == "cover.jpg") continue;
+
     metadata(entry.path(), artist, album, index);
     printf("Finished writting metadata for %s.\n", entry.path().c_str());
     std::filesystem::remove(entry.path());
     index++;
   }
 
-  printf("Finished writing metadata for %s by %s.\n", album.c_str(), artist.c_str());
+  printf("Finished writting metadata for %s by %s.\n", album.c_str(), artist.c_str());
 
   return true;
 }